package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加至购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());//每个人只能查看到自己购物车的数据


        List<ShoppingCart> shoppingCartList =  shoppingCartMapper.list(shoppingCart);//查看购物车中的数据
        if(shoppingCartList != null && shoppingCartList.size() == 1){//商品的数量为1
            //如果物品在购物车中就加一
            shoppingCart = shoppingCartList.get(0);//获取索引
            shoppingCart.setNumber(shoppingCart.getNumber()+1);//数量加1
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果不存 插入数据为1（是菜品还是套餐）
            Long dishId = shoppingCartDTO.getDishId();//判断当前添加到购物车的是菜品还是套餐
            if(dishId != null){
                //菜品--购物车
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //套餐---购物车
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showCartList() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void deleteCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        shoppingCartMapper.deleteCart(shoppingCart);
    }


    /**
     * 删除其中一个商品
     */
    @Override
    public void deleteOne(ShoppingCart shoppingCart) {
        /*ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());//当前用户的购物车
        //判断商品是否在购物车
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        System.out.println(shoppingCartList);
        if(shoppingCartList != null && shoppingCartList.size()>=1){
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
        //删除之后，菜品或套餐应该在购物车中不显示
        if(shoppingCart.getNumber() <= 0){
            shoppingCartMapper.deleteOneCart(shoppingCart.getUserId());
        }*/
        ShoppingCart cart = shoppingCartMapper.selectCart(shoppingCart);
        System.out.println(cart.getNumber());
        if(cart.getNumber() >1){
            cart.setNumber(cart.getNumber() -1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            shoppingCartMapper.deleteOneCart(cart.getId());
        }
    }

}